From a line of four: Left end of the line crosses over to the other end of the line to reverse facing direction as the other three face toward the vacated end, take one step forward and then turn another quarter in the same turning direction. Finishes in a line of four facing opposite to original direction.
Holman Hudspeth 1968
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.